Bone Ranger

The Bone Ranger appears as a skeleton holding only a saber in its right hand. Their movement behavior is not as smart as most other enemies, since they only move when you are out of sight, but still try to attack you when there are smaller obstacles in their way which block their shots. (Editor note: might be a bug, or just meant to be since they have no brains?)

Bone Rangers throw their swords directly at you from their position. It doesn't matter to them if you're right in front of them or on the other side of a gigantic room, they'll still try to hit you from their current position and will not move until you are out of sight. Once they break line of sight with you, they will walk toward your current position in a straight line (this allows them to get stuck on walls). When walking, they will still pause to attack periodically.

The swords themselves move very slowly while rotating in the air, making it easy to dodge them, but the Bone Ranger seems to have an infinite supply of them and throws them quickly, allowing multiple swords to be in the air before the first one even reaches you. However, the swords do have a limited range and will simply disappear if the range limit is reached.